Contents
What is 5G Pucch?
PUCCH is an uplink physical channel that carries UCI (Uplink Control Information). As DCI (Downlink Control Information) is carried by PDCCH, UCI is carried by PUCCH.
What is a Pucch format?
PUCCH (Physical Uplink Control Channel) carries a set of information called “UCI(Uplink Control Information)”. (This is similar to PDCCH which carries DCI (Downlink control information)”.
How many Pucch formats exist?
There exist 3 different PUCCH formats. PUCCH format 1, 1a and 1b carry SRs and one or two HARQ ACK/NACKs, respectively. Multiplexing of SR with HARQ feedback is also possible. PUCCH format 2 can carry up to 11 bits of information is used for CSI feedback.
What is Pucch and Pusch in LTE?
The LTE uplink physical layer has a triplet of physical channels; Physical Uplink Shared Channel (PUSCH), Physical Uplink Control Channel (PUCCH) and Physical Random Access Channel (PRACH). The PUSCH is used for transmitting user traffic data in multiplex with Uplink Control Information (UCI), if necessary.
What is PRB in 5G?
A E-UTRA PRB (Physical Resource Block) is defined as consisting of 12 consecutive subcarriers for one slot (0.5 ms). A PRB is the smallest element of resource allocation assigned by the eNB scheduler.
What is HARQ ACK?
HARQ stands for Hybrid Automatic Repeat Request. HARQ = ARQ + FEC (Forward Error Correction)/Soft Combining. ARQ refers to Automatic Repeat Request i.e. if sender doesn’t receive Acknowledgement (ACK) before timeout, the receiver discards the bad packet and sender shall re-transmits the packet.
What is DCI format in LTE?
DCI stands for downlink control information and there are various DCI formats used in LTE in PDCCH. The DCI format is nothing but a predefined format in which the downlink control information is packed/formed and transmitted in PDCCH. The packed DCI information is the payload to the PDCCH encoding chain.
What is PRB in LTE?
In LTE, a Physical Resource Block (PRB) is defined as consisting of 12 consecutive subcarriers for one slot (0.5 ms), and is the smallest element of resource allocation assigned by the eNodeB scheduler.
What is RRC in LTE?
The Radio Resource Control (RRC) protocol is used in UMTS, LTE and 5G on the Air interface. It is a layer 3 (Network Layer) protocol used between UE and Base Station. The operation of the RRC is guided by a state machine which defines certain specific states that a UE may be present in.
What is the difference between LTE and 5G NR resource block?
In LTE resource block bandwidth is fixed to 180 KHz but in NR it is not fixed and depend on sub-carrier spacing. The NR is expected to work with 100 MHz channel bandwidth for lower bands < 6 GHz and 400 MHz channel bandwidth higher bands in mmWave ranges.
How many OFDM symbols are in 5G NR PUCCH?
• 5G NR PUCCH is flexible in time domain and frequency domain. • The PUCCH channel utilizes five PUCCH formats. • PUCCH format 0 and 2 occupies 1 or 2 OFDM symbols. It is known as short PUCCH. • PUCCH format 1, 3 and 4 occupies 4 to 14 OFDM symbols.
How to use 5G NR PUCCH format-0 for multiplexing?
In 5G-NR PUCCH format-0, for multiplexing of UE’s (i.e., UE’s sharing the same RB for resource allocation) which are sending the same/different HARQ’s or SR should have different initial cyclic shift (m0) values or can all UE’s which are gonna multiplex in same RB (Resource Block) have same m0 value? Know someone who can answer?
What are the different types of PUCCH format?
• PUCCH format 0 and 2 occupies 1 or 2 OFDM symbols. It is known as short PUCCH. • PUCCH format 1, 3 and 4 occupies 4 to 14 OFDM symbols. It is known as long PUCCH. • PUCCH format 0 and 1 carry UCI payloads having 1 or 2 bits. • Other PUCCH formats carry UCI payloads having more than 2 bits.
What kind of UCI is used in 5G NR?
This page describes 5G NR UCI (Uplink Control Information). It mentions PUCCH formats used to carry various UCI payload sizes in 5G NR uplink. UCI (Uplink Control Information) is carried by PUCCH channel in 5G NR.